Ruling on eating KFC (Kentucky Fried Chicken)

Muslim pilgrims line up at a KFC restaurant outside the Grand Mosque in Mecca December 13, 2007. Around 1.5 million Muslims from around the world are expected to arrive in Saudi Arabia for the haj pilgrimage. REUTERS/Ali Jarekji (SAUDI ARABIA)

I work for about three years in KFC. They told me that the chicken is halaal. They also had a certificate. But now i have checked the e-codes on the site guidedway.com and i have seen that it is mushbooh. So i want to know ur opinion.
And i have one more very important question. They use shortening(oil). i checked that about shortening on guidedway.com and it says IT DEPENDS. so i am not sure whether is haraam or halaal. my question is can I eat fries or is it better to avoid it.
What is the ruling on fish burger?.

Praise be to Allaah.
Firstly:

In order for it to be permissible to eat chicken and meat that is sold in Muslim countries and elsewhere, two conditions must be met:

1. The meat should have been slaughtered in the manner prescribed in sharee‘ah; it should not have been stunned with electricity, or drowned in water, or any other means of killing that is done in some countries.

2. The one who slaughtered the meat should have been a Muslim or a kitaabi (one of the people of the Book, i.e., a Jew or Christian); it is not permissible to eat meat slaughtered by a communist, atheist or idol-worshipper.

See the answer to question no. 83362.

If it becomes clear to you that the chicken sold in these restaurants has not been slaughtered in the manner prescribed in sharee‘ah, it is not permissible for you to eat it and it is not permissible for you to work with those who sell it, because that comes under the heading of cooperating in sin and transgression.

Secondly:

It is permissible to eat fried meat and fish from these restaurants, subject to two conditions:

1. That it is not fried in the same oil as the non-halaal chicken or in vessels in which chicken was fried, until they have been washed, because the non-halaal chicken is maytah (dead meat) and is najis (impure).